Calipers and dividers.



H. L. AUSTIN- CALIPERS AND DIVIDERS. APPLICATION HLED MAR. 6. I917.-

Lzsm a I Patented Aug. 21, 1917.

H-L Aust irv.

attoz we x1 HARRY L. AUSTIN, F HURON, SOUTH DAKOTA.

CALIPERS AND DIVIDERS.

Specification of Letters Patent.

Patented A11 21, 1917.

Application filed. March 6, 1917. Serial No. 152,846.

To all whom it may concern:

Be it known that I, HARRY L. AUs'rIN, aoitizen of the United States,residing at Huron, in the county of Beadle, State of South Dakota, haveinvented certain new and useful Improvements in Calipers and Dividers;and I do hereby declare the following to be a full, clear, and exactdescription of the invention such as will enable others skilled in theart to which it appertains to make and use the same.

This invention is an improvement in measuring instruments and hasparticular reference to calipers and like devices.

An object of the invention is to provide an improved adjusting means forthe arms of a caliper or divider whereby the strain on the screwmembers, incident to some instruments now commonly employed, isrelieved.

Another object is the provision of a device of this character which issimple in construction, easy to manufacture and effective in carryingout the purpose for which it is designed.

The inventive idea involved is capable of receiving a variety ofmechanical expressions one of which for the purpose of illustratin g thepresent invention, is shown in the accompanying drawing, wherein Figure1 is a side elevation of a caliper constructed in accordance with theinvention.

Fig. 2 is an edge elevation thereof.

Fig. 8 is a longitudinal section.

Fig. 4: is a detail perspective view of one of the ball housings.

Referring more particularly to the accompanying drawing in which likereference characters indicate similar parts the numerale 5 and 6indicate the usual arms of the caliper pivoted at 7 and provided withthe usual handle 8.

The adjusting means which comprises the essential feature of thisinvention is shown in what is now believed to be its preferred form andconsists in providing the leg or arm 5, intermediate its ends, with aball bearing seat 7 in its outer edge which communicates with anelongated cut out portion or slot 8 upon the inner edge thereof. Thebearing member 9, preferably in the form of a ball is mounted upon theseat 7 and is retained in position therein by the housing 10 having itscentral portion enlarged and provided with a recess 11 to accommodate aportion of the bearing 9 and also having its ends countersunk in theouter edge of the arm 5 and secured thereto by means of suitablefasteners 12.

The arm 6 of the instrument is also provided with a bearing seat 13 inthe outer edge thereof which communicates with a slot 1% formed in theinner edge of said arm and disposed opposite to the seat 7 and slot 8 inthe arm 5. The seat 13 also receives a ball bearing member 15 having acentral screw threaded opening 16 extending therethrough said memberbeing retained in its position in said seat by a housing plate 17constructed similarly to the plate 10 and secured to the outer edge ofthe arm 6 by means of fasteners 18. The housing 17 is provided with anelongated longitudinally extending slot 19 through which extends anadjusting device 20 preferably in the form of a screw member having amilled head 21 at one end. This screw member is also threaded in thescrew threaded opening 16 of the bearing member 15 and has its other endsecured in a socket in the bearing member 9.

In practice, it will be apparent by turning the screw member 20 in eithedirection the arms 5 and 6 will be adjusted toward or away from eachother and by reason of the slots 8 and 14: and 19. the arms of thedevice will be permitted to swing about their pivot until the ends ofsaid slots engage the screw member and it will also be apparent that anystrain upon the latter is prevented.

What is claimed is 1. In a measuring instrument including a pair ofarms, each of which is provided with a communicating bearing seat andslot, a bearing member mounted in each of said seats. one of saidbearing members having a screw threaded opening therethrough, a housingplate for each bearing member one of which has an elongated slot, and ascrew threaded adjusting device extending through and adjustable in aslot in said housing plate, the screw threaded opening in said bearingmember, the slots in said arms and secured to the other bearing member.

2. In a measuring instrument including a pair of pivoted arms, each ofwhich is provided upon its outer edge with a bearing seat and upon itsinner edge with a slot communicating with said seat, a bearing membermounted in the seat of one of said arms. a housing secured to the outeredge of the last named arm and having a seat for bearing member having alongitudinal slot receiving said bearing member, a second second bearingmember, and the slot in the 1) bearing member mounted in the seat of thesecond named housing.

other arm and havingascrew threaded open- Intestimony whereof, I afliXmy signaing therethrough, a housing for said second tnre, in thepresence of two witnesses.

V HARRY L. AUSTIN.

therein, and a screw member having one end secured to the first namedbearing member W'itnesses: and extending through the slots in, said W;H, ALLINGHAM. arms, the screw threaded opening in the EARL J. KINsMAN.

copie s otj this patent maybe o bta ined for five cents each, byeddressingthe Commissioner o1 Ratents,

Washington, .D. 0.. Y

